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L’améthyste cactus est une curiosité minéralogique rare . Elle se distingue des autres Améthystes par la forme de sa cristallisation. En effet, des micro cristaux d’Améthyste se sont formés tout autour d’un quartz blanc principal , à six faces . Sa couleur est assez claire car elle contient en faible quantité du fer et du manganèse.
Spécimen de collection
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